CN-224209712-U - Machining tool for excircle of large-size stainless steel pipe fitting

Abstract

The outer circle machining tool for the large-size stainless steel pipe fitting comprises a screw rod, a fixed end cover and a locking nut, wherein center holes are formed in the two ends of the screw rod body, the length of the screw rod body is larger than that of a workpiece in the axial direction, external threads are formed in the extending ends of the screw rod body, the fixed end cover is installed in a concentric positioning fit mode at the two ends of the workpiece, an end cover center hole formed in the fixed end cover is installed in a concentric positioning fit mode with the screw rod, the center of the workpiece is transferred to the center of the fixed end cover through the end cover center hole, the locking nut is installed in a screwed fit mode at the two ends of the screw rod, and the locking nut clamps the fixed end cover of the workpiece in a butt joint mode, so that the workpiece and the screw rod are concentrically locked and fastened together. The utility model solves the technical problem that the large-size stainless steel pipe workpiece cannot be clamped and machined on an ME1332A external grinding machine with high precision, the machining precision grade can reach IT5 and IT7, the surface roughness is less than 0.2 mu m, and the high-precision, high-efficiency and low-cost machining of the external circle of the large-size stainless steel pipe workpiece is realized.

Inventors

• WANG BAIYAN
• CHE JINPING
• ZHANG PENG
• MAO HONGPING

Assignees

• 陕西渭河工模具有限公司

Dates

Publication Date

20260508

Application Date

20250530

Claims (6)

1. 1. A large-size stainless steel pipe fitting excircle machining tool is characterized by comprising a screw rod (2), a fixed end cover (3) and a locking nut (4), wherein central holes are respectively formed in the end faces of two ends of a rod body of the screw rod (2), the length of the rod body of the screw rod (2) is larger than that of a workpiece (1), two ends of the rod body of the screw rod (2) extend out of two ends of the workpiece (1), external threads (201) are formed in the extending ends of the rod body of the screw rod (2), the fixed end cover (3) is installed in a concentric positioning and adapting mode at two ends of the workpiece (1), an end cover center hole (301) is installed in a concentric positioning and adapting mode at the fixed end cover (3), the end cover center hole (301) transfers the center of the workpiece (1) to the center of the fixed end cover (3), the locking nut (4) is installed in a screwed and matched mode at two ends of the screw rod (2), and the locking nut (4) clamps the fixed end cover (3) of the workpiece (1) in a concentric locking mode, and the workpiece (1) and the screw rod (2) are fastened together in a concentric mode.
2. 2. The tool according to claim 1, further comprising a gasket (5), wherein the gasket (5) is arranged between the outer side end face of the fixed end cover (3) and the inner side end face of the lock nut (4).
3. 3. The tool as claimed in claim 2, wherein the outer diameter of the gasket (5) is larger than the inner diameter of the end cover core hole (301), and the gap of the central hole of the gasket (5) is matched with the rod body of the screw rod (2).
4. 4. The tool set forth in claim 1 or 2, wherein the fixed end cover (3) is of a T-shaped structure, and the diameter phi 1 of the large diameter end of the fixed end cover (3) is smaller than the outer diameter of the workpiece (1), and meanwhile, the diameter phi 1 of the large diameter end of the fixed end cover (3) is larger than the inner diameter of the workpiece (1).
5. 5. The tool as claimed in claim 4, wherein the diameter phi 2 of the small diameter end of the fixed end cover (3) is concentrically positioned and matched with the inner hole of the workpiece (1), and the fit clearance is not more than 0.02mm.
6. 6. The tool as claimed in claim 5, wherein the fixed end cover (3) and the screw rod (2) are made of 45 steel subjected to surface oxidation treatment.

Description

Machining tool for excircle of large-size stainless steel pipe fitting Technical Field The utility model belongs to the technical field of machine tool metal machining tools, and particularly relates to a large-specification stainless steel pipe piece excircle machining tool. Background In the field of machining, the stainless steel pipe fitting is mainly applied to the scenes of fluid transmission, heat exchange pipelines and the like, and the stainless steel has good oxidation resistance, heat resistance, toughness and wear resistance, and belongs to a difficult-to-machine material in grinding machining. ME1332A cylindrical grinding machine has processing advantages for some small-sized parts with center holes, but cannot center positioning processing for large-sized stainless steel pipe fittings with larger partial diameters and longer lengths. The added large-size stainless steel pipe has large weight and long length, and the cutting force generated during grinding is large, and the rigidity of the ME1332A cylindrical grinding machine can not bear the large cutting force, so that the vibration of the machine tool is aggravated, and the machining precision and the surface quality are affected. In addition, when the workpiece length is long, vibration during grinding is also increased, further affecting the machining accuracy. In this regard, the following improvements have been proposed. Disclosure of utility model The technical problem that the large-size stainless steel pipe workpiece cannot be clamped and machined on an ME1332A outer circle grinding machine with high precision is solved by transferring the center of the stainless steel pipe workpiece to the center of a screw rod fixing end cover. The technical scheme includes that the tool comprises a screw rod, fixed end covers and locking nuts, wherein central holes are respectively formed in end faces of two ends of a screw rod body, the length of the screw rod body is larger than that of a workpiece in the axial direction, two ends of the screw rod body extend out of two ends of the workpiece, external threads are formed in the extending ends of the screw rod body, the fixed end covers are arranged at the two ends of the workpiece in a concentric positioning fit mode, end cover center holes are formed in the fixed end covers, the end cover center holes are arranged in a concentric positioning fit mode with the screw rod, the end cover center holes transfer the center of the workpiece to the center of the fixed end covers, the locking nuts are respectively arranged at the external threads at the two ends of the screw rod in a screwed fit mode, and the locking nuts clamp the fixed end covers of the workpiece in a butt joint mode, so that the workpiece and the screw rod are concentrically locked and fastened together. In the technical scheme, the locking nut further comprises a gasket, wherein the gasket is arranged between the outer end face of the fixed end cover and the inner end face of the locking nut. In the technical scheme, the outer diameter of the gasket is larger than the inner diameter of the end cover center hole, and the gap of the gasket center hole is matched with the screw rod body. In the technical scheme, the fixed end cover is of a T-shaped structure, the diameter phi 1 of the large-diameter end of the fixed end cover is smaller than the outer diameter of the workpiece, and the diameter phi 1 of the large-diameter end of the fixed end cover is larger than the inner diameter of the workpiece. In the technical scheme, the diameter phi 2 of the small diameter end of the fixed end cover is concentrically positioned and matched with the inner hole of the workpiece, and the fit clearance is not more than 0.02mm. In the technical scheme, the fixed end cover and the screw rod are processed by 45 steel with surface oxidation treatment. Compared with the prior art, the utility model has the advantages that: 1. The utility model can effectively finish the outer circle of the large-specification stainless steel pipe, the precision grade can reach IT5 and IT7, and the surface roughness is less than 0.2 mu m. 2. According to the ultra-long rod body of the screw rod, the workpiece positioning center is transferred through the fixed end cover, so that the excircle of the large-specification stainless steel pipe workpiece is processed with high precision, high efficiency and low cost. 3. The gasket is arranged, so that the end face is prevented from being crushed, the service life of the tool is prolonged, the maintenance and replacement cost is reduced, different workpieces are matched through the thickness adjustment of the gasket, and the utilization rate of the tool is improved. 4. The clearance between the fixed end cover and the inner hole of the workpiece in a concentric positioning and adapting way is less than or equal to 0.02mm, the coaxiality and the surface quality of the outer circle are obviously improved, the high-precision machinin